<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Hello, world!</title>
    <!-- Bootstrap 的 CSS 文件 -->
    <link rel="stylesheet" href="http://cdn.bootcss.com/bootstrap/3.3.5/css/bootstrap.min.css">
    <style>
       

        .form-group {
            width: 30%;
            margin: 50px auto;
        }
    </style>

</head>
<body>
    <div class="container">
        <form action="">
            <div class="form-group">
                <label for="name">name</label>
                <input type="text" class="form-control" id="inputName">
                <label for="age">age</label>
                <input type="text" class="form-control" id="inputAge">
                <button type="submit" class="btn btn-primary">Submit</button>
            </div>
        </form>

    </div>



<script src="http://cdn.bootcss.com/jquery/1.11.3/jquery.min.js"></script>
<script src="http://cdn.bootcss.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
</body>
</html>